CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Light bulb. Lit light bulb showing the glowing filament within it. The light bulb filament is made of a fine, tungsten wire which heats up and glows as an electric current is passed through it. Tungsten is an ideal material for a filament as it is strong and has a high melting point. The interior of the bulb contains an inert gas or vacuum. This is to exclude oxygen which would cause corrosion of the tungsten. Whilst in use, the tungsten filament gradually evaporates away until it breaks.
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